(!!) 12BY7 Sylvania coated glass NOS 1953 faded printing (21.5ma)

12BY7 Sylvania coated glass NOS 1953 faded printing

21.5ma

Gm=10,200

Tested on Amplitrex AT1000

Vplate=250V

Vscreen=180V

Iplate Ma (good) = 20-30ma

Gm = 11,000

Heathkit DX-35 1950's
Kenwood TS-830S Transceiver
Kenwood 520
Kenwood TS-20
Yaesu FT-101 Transceiver

12BV7 is close substitute